The main part of barcamps are sessions. They will be planned together by all participants on the day of the barcamp. The interest of the audience determines how big the room for the workgroups should be.
A successful session contains dialogue. Pure presentations of yourself, your product, or your company are undesired. Barcamps are exchange platforms where knowledge is shared, questions can be asked, and topics are worked on together.
You don’t need to be overly prepared for your session, you even have the possibility to offer one spontaneously. However, it is usual to think about it beforehand.
A session lasts 45 minutes at most.